4.6 Article

Refinement of the equation of state of tantalum

Journal

PHYSICAL REVIEW B
Volume 69, Issue 9, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.69.092106

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The volume of tantalum versus pressure has been accurately measured up to 101 GPa by single-crystal x-ray diffraction, with helium as pressure transmitting medium. Slight deviation from previous static determinations is observed. Discrepancy with reduced shock-wave and ultrasonic data supports recent doubts about the calibration of the ruby pressure scale. Finally, first-principle calculations of the literature show a positive curvature in P(V) relative to the experimental data, even with a modified pressure scale.

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